regulator: fix build when CONFIG_REGULATOR_DUMMY=n

Commit f03f91826 (regulator: Add option for machine drivers
to enable the dummy regulator) in the regulators tree
seems to have introduced the following build break when
CONFIG_REGULATOR_DUMMY is disabled. Fix this.

CC drivers/regulator/dummy.o
drivers/regulator/dummy.c:41: error: redefinition of 'regulator_dummy_init'
drivers/regulator/dummy.h:28: note: previous definition of 'regulator_dummy_init' was here
make[2]: *** [drivers/regulator/dummy.o] Error 1
make[1]: *** [drivers/regulator] Error 2
make: *** [drivers] Error 2

Signed-off-by: Anand Gadiyar <[e-mail]>
Cc: Liam Girdwood <[e-mail]>
Cc: Mark Brown <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Liam Girdwood <[e-mail]>

drivers/regulator/dummy.h

···
 
 extern struct regulator_dev *dummy_regulator_rdev;
 
-#ifdef CONFIG_REGULATOR_DUMMY
 void __init regulator_dummy_init(void);
-#else
-static inline void regulator_dummy_init(void) { }
-#endif
 
 #endif